I have loans on two of the properties and am concerned that if I transfer the properties into an LLC that the loans would be called . 

All comps must have Days on Market data with them for each comp cited5.

Data and Analysis Tools: Making Informed DecisionsReal estate investing is about more than just buying properties; it’s about making smart investments that will give you a strong return over time.

I only use zillow but it only shows trend for individual properties, not for entire areas.Uhaul has great information on inflow and outflow - there is lots of data on that.

I would ensure utilities are transferred out of your name also.

They may "forget" to tell you that the tenant paid a double deposit, and then not transfer that deposit to you at closing.Your offer to purchase should include a requirement that the Seller provide all documentation and agree to sign an estoppel certificate (also called an estoppel form or agreement).

Platforms like Rentometer and Zillow can give you rent data to compare properties.Networking Locally: Reach out to agents and local investors.

@Diana JingIf your IRA and 401k are not of the "self-directed" variety allowing for investment into real estate, you'll need to transfer those assets to an account that is, namely a self-directed Solo 401k or self-directed IRA.

They say they use Key Data (not AirDNA). 

Or, you or the insurer could have the lien transferred to a bond removing it from the property.